Unit Converter
Convert between metric and imperial units of length, area, volume, mass and temperature.
Inputs
Result
100 mm =
3.937008in
- Centimeters
- 10cm
- Meters
- 0.1m
- Kilometers
- 0.0001km
- Feet
- 0.328084ft
- Yards
- 0.109361yd
- Miles
- 0.000062mi
How it works
Pick a quantity — length, area, volume, mass or temperature — enter a value and choose the units to convert from and to. The main result updates instantly, and every other unit in the same quantity is listed below so you rarely need a second conversion.
All conversions go through an exact base unit (meter, square meter, liter or kilogram) using the international definitions, so results are accurate to the last digit shown. Temperatures are converted through Celsius.
Formula
- Result = Value × (From factor ÷ To factor)
- 1 in = 25.4 mm · 1 ft = 0.3048 m
- 1 lb = 0.45359237 kg · 1 US gal = 3.785411784 L
- °F = °C × 9 ÷ 5 + 32 · K = °C + 273.15
Example
Convert 100 mm to inches
- 1100 mm = 0.1 m
- 20.1 m ÷ 0.0254 m/in = 3.937 in
100 mm = 3.937008 in.
Frequently asked questions
How many millimeters are in an inch?
Exactly 25.4 mm. The inch has been defined this way since 1959.
Which gallon does the converter use?
Both are available: the US gallon (3.785 L) and the imperial gallon (4.546 L).
How do I convert kilograms to pounds?
Divide by 0.45359237, or multiply by about 2.2046. For example, 10 kg ≈ 22.05 lb.